METHOD AND APPARATUS FOR DISABLING ANTI-COPY PROTECTION SYSTEM IN VIDEO SIGNALS - Patent 0559763

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(11)

EP 0 559 763 A1

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(43)	Date of publication:
	15.09.1993 Bulletin 1993/37

(21)	Application number: 92900950.0

(22)	Date of filing: 07.11.1991

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International Patent Classification (IPC):

G11B 20/ 02^{( . )}
G11B 27/ 028^{( . )}
H04N 5/ 91^{( . )}
G11B 27/ 024^{( . )}

G10D 9/ 04^{( . )}
H04N 5/ 7826^{( . )}
H04N 5/ 913^{( . )}

(86)	International application number:
	PCT/US1991/008342

(87)	International publication number:
	WO 1992/009171 (29.05.1992 Gazette 1992/12)

(84)	Designated Contracting States:
	DE ES FR GB IT NL

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Priority:

13.11.1990 US 19900614185

(60)	Divisional application:
	98107026.1 / 0858219

(71)	Applicant: MACROVISION CORPORATION
	Mountain View, CA 94040 (US)

(72)	Inventors:
	QUAN, Ronald Cupertino, CA 95014 (US) PERUZZI, John, F. Redwood City, CA 94061 (US)

(74)	Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät
	Maximilianstrasse 58 D-80538 München D-80538 München (DE)

(54)	METHOD AND APPARATUS FOR DISABLING ANTI-COPY PROTECTION SYSTEM IN VIDEO SIGNALS